夹芯复合材料T型接头侧弯损伤机理及强度特性分析  

Research on damage mechanism and lateral bending strength characteristic of sandwich T-joint

作　　者：周晓松[1] 梅志远[1] 

机构地区：[1]海军工程大学舰船工程系,武汉430033

出　　处：《海军工程大学学报》2016年第3期29-34,共6页Journal of Naval University of Engineering

基　　金：国家自然科学基金资助项目(51479205)

摘　　要：针对复合材料夹芯板材构件的侧弯承载和坚固连接要求,设计了弧形过渡区增强型T型胶接接头。建立了夹芯复合材料T型接头数值模型,模拟了其在侧弯载荷作用下的损伤产生、扩展及失效过程,并对夹芯复合材料T型接头试件进行了静态侧弯试验。结果表明：接头发生初始损伤的线载荷强度为44～47N/mm,损伤发生后接头的刚度值发生折减（降低约28%～32%）,此时接头的承载能力仍在上升;试件界面完全剥离载荷强度较初始损伤线载荷强度略有增加（线载荷强度范围为54～62N/mm）。数值计算与试验结果吻合,表明弧形过渡区是夹芯复合材料T型接头最薄弱的部位,易发生破坏;初始损伤将首先出现在弧形过渡区复合材料表层,随着层间裂纹的扩展,过渡区复合材料与芯材的复合界面处出现剥离破坏并向自由端端部界面扩展,这是导致夹芯复合材料T型胶接接头失效的最主要原因。The arc-enhancement T-joint is put forward and the primary configuration is designed to meet the need for the shear strength and the strong connection between vertical plates.The numerical mode of sandwich T-joints is built by finite element analysis software and its cohesive mode technique.The damage formation,extension and failing process of sandwich T-joints under lateral bend load are investigated.The test results demonstrate that the initial damage load is between 44 N/mm and47N/mm,and when the damage is caused,the initial stiffness on the sandwich T-joints decreases sharply（approximately by 28% ～32%）.The ultimate damage load is between 54N/mm and 62N/mm,which is slightly higher than initial one,because the arc-enhancement area is destroyed.Both of the numerical and test results confirm that the arc-enhancement area is the weakest part of the sandwich T-joints where the damage first appears.The initial damage firstly appears at the surface of the transition zone.The delamination then rapidly spreads to the free-end interface with the propagation of cracks.It is the peeling off the glue film that accounts mostly for the failure of sandwich T-joints.

关 键 词：复合材料 T型接头 损伤机理 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]